From 5707871b229bacc46c76999465809bd8e672c37b Mon Sep 17 00:00:00 2001
From: Janne Pohjolainen <xaphod@iki.fi>
Date: Thu, 4 Jun 2015 22:56:29 +0200
Subject: [PATCH] updated readme

---
 README.md | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/README.md b/README.md
index 9fc4b4b..a1d0c19 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,13 @@
 # calc-date
+
+```shell
+usage: ./calc-date <date> +-<delta>|<date>
+
+date    iso8601 format, e.g. 2015-06-01T09:45:53
+delta   time to count from date. Select operation with + or - followed
+        by any combination of:
+        <n>d for days,
+        <n>h for hours,
+        <n>m for minutes
+        <n>s for seconds.
+```